![]() ![]() Using an adjusted LD 50 method, T-REX calculates LD 50 ft -2 values for both broadcast and banded (granular and liquid) applications. Based on residue and dissipation rate calculations, this spreadsheet-based model also estimates acute and reproductive risk quotients. ![]() ![]() T-REX calculates the residues on avian and mammalian food items along with the dissipation rate of a chemical applied to foliar surfaces for single or multiple applications. This document will provide directions on how to use T-REX and will explain how to estimate exposure concentrations and risk quotients for birds and mammals. Welcome to the Terrestrial Residue EXposure (T-REX) model User's Guide. The authors would also like to thank the members of the Terrestrial Biology and Terrestrial Exposure Technology Teams for their input and assistance in the development of this User's Guide and Spreadsheet. (Link to-) Initial Pesticide Residues on Arthropods
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